I'd like to know where (online) I can find information regarding the
valuation of dolls (Barbie dolls in particular) - links to websites,
articles etc

Any specific articles with high valuations would be extra appreciated

Hi! Thanks for the question.

Here are some websites providing tips on Barbie Doll valuation.

Eslwhere ? This site has very detailed pricing information for
different types of Barbie dolls. Just click on the link (organized in
alphabetical form for Barbie types) and you will get a wealth of
information.
http://www.elswhere.net/valguide.htm 

Classic Barbie Dolls ? About.com has a good overview of different
classic Barbie dolls and how much they sell on the market. Just click
on each doll picture.
http://collectdolls.about.com/library/blgallpvinbarb.htm 

Modern Barbie Value Guide ? Here is a small site providing a good
estimate of modern Barbie doll values.
http://www.geocities.com/CapitolHill/1080/holiday1.htm 

E-Assortment ? Here is another article discussing how much one could
sell their particular Barbie dolls.
http://md.essortment.com/barbiedollvalu_rrms.htm

Ehow.com ? The following website doesn?t give specific prices but
provides some practical tips instead in properly valuing your dolls.
http://www.ehow.com/how_9777_determine-value-barbie.html 

Some good books are also worthy of consideration when looking for
Barbie doll pricing information. The next sites have some list of
books.

Barbie Collector
http://www.barbiecollector.com/collecting/value.asp 

?VALUE GUIDES: DOLLS? 
http://www.speakeasy.org/~duchess/vg14doll.html 


Search terms used:
Barbie Doll Valuation
Vale of Barbie Dolls
 
I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
                                                          
                              
Regards,                              
Easterangel-ga                              
Google Answers Researcher

Excellent!

These links may help:

http://collectdolls.about.com/cs/collectingdolls/a/dollvalue.htm
http://collectdolls.about.com/cs/moderndolls/a/dollvalueII.htm
http://collectdolls.about.com/cs/howtos/ht/howtovalue.htm
http://collectdolls.about.com/library/blgallpabout.htm
http://collectdolls.about.com/library/blgallp.htm

Best regards,
Rainbow

Thanks for the 5 stars, for the kind word and for the generous tip~ :)